From 8b247ef752dc5aed7e5840f9410e619dbf4ee00c Mon Sep 17 00:00:00 2001
From: Jordan Justen <jordan.l.justen@intel.com>
Date: Mon, 30 May 2016 18:52:06 -0700
Subject: [PATCH] MdePkg BaseMemoryLibMmx: Convert X64/ZeroMem.asm to NASM

The BaseTools/Scripts/ConvertMasmToNasm.py script was used to convert
X64/ZeroMem.asm to X64/ZeroMem.nasm

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Jordan Justen <jordan.l.justen@intel.com>
---
 .../BaseMemoryLibMmx/BaseMemoryLibMmx.inf     |  2 +
 .../Library/BaseMemoryLibMmx/X64/ZeroMem.nasm | 56 +++++++++++++++++++
 2 files changed, 58 insertions(+)
 create mode 100644 MdePkg/Library/BaseMemoryLibMmx/X64/ZeroMem.nasm

diff --git a/MdePkg/Library/BaseMemoryLibMmx/BaseMemoryLibMmx.inf b/MdePkg/Library/BaseMemoryLibMmx/BaseMemoryLibMmx.inf
index 3222ef89a8..fee9cae168 100644
--- a/MdePkg/Library/BaseMemoryLibMmx/BaseMemoryLibMmx.inf
+++ b/MdePkg/Library/BaseMemoryLibMmx/BaseMemoryLibMmx.inf
@@ -96,6 +96,7 @@
   Ia32/CopyMem.asm
 
 [Sources.X64]
+  X64/ZeroMem.nasm
   X64/ZeroMem.asm
   X64/ScanMem64.asm
   X64/ScanMem32.asm
@@ -115,6 +116,7 @@
   X64/SetMem64.S
   X64/SetMem32.S
   X64/SetMem16.S
+  X64/ZeroMem.nasm
   X64/ZeroMem.S
   X64/SetMem.S
   X64/CopyMem.S
diff --git a/MdePkg/Library/BaseMemoryLibMmx/X64/ZeroMem.nasm b/MdePkg/Library/BaseMemoryLibMmx/X64/ZeroMem.nasm
new file mode 100644
index 0000000000..019b31fa28
--- /dev/null
+++ b/MdePkg/Library/BaseMemoryLibMmx/X64/ZeroMem.nasm
@@ -0,0 +1,56 @@
+;------------------------------------------------------------------------------
+;
+; Copyright (c) 2006, Intel Corporation. All rights reserved.<BR>
+; This program and the accompanying materials
+; are licensed and made available under the terms and conditions of the BSD License
+; which accompanies this distribution.  The full text of the license may be found at
+; http://opensource.org/licenses/bsd-license.php.
+;
+; THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
+; WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
+;
+; Module Name:
+;
+;   ZeroMem.nasm
+;
+; Abstract:
+;
+;   ZeroMem function
+;
+; Notes:
+;
+;------------------------------------------------------------------------------
+
+    DEFAULT REL
+    SECTION .text
+
+;------------------------------------------------------------------------------
+;  VOID *
+;  InternalMemZeroMem (
+;    IN VOID   *Buffer,
+;    IN UINTN  Count
+;    );
+;------------------------------------------------------------------------------
+global ASM_PFX(InternalMemZeroMem)
+ASM_PFX(InternalMemZeroMem):
+    push    rdi
+    mov     rdi, rcx
+    mov     rcx, rdx
+    mov     r8, rdi
+    and     edx, 7
+    shr     rcx, 3
+    jz      @ZeroBytes
+    DB      0xf, 0xef, 0xc0             ; pxor mm0, mm0
+.0:
+    DB      0xf, 0xe7, 7                ; movntq [rdi], mm0
+    add     rdi, 8
+    loop    .0
+    DB      0xf, 0xae, 0xf0             ; mfence
+@ZeroBytes:
+    xor     eax, eax
+    mov     ecx, edx
+    rep     stosb
+    mov     rax, r8
+    pop     rdi
+    ret
+